Annotation of sys/net/if_dl.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: if_dl.h,v 1.6 2003/06/02 23:28:12 millert Exp $ */
! 2: /* $NetBSD: if_dl.h,v 1.8 1995/03/26 20:30:13 jtc Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1990, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
! 33: */
! 34:
! 35: /*
! 36: * A Link-Level Sockaddr may specify the interface in one of two
! 37: * ways: either by means of a system-provided index number (computed
! 38: * anew and possibly differently on every reboot), or by a human-readable
! 39: * string such as "il0" (for managerial convenience).
! 40: *
! 41: * Census taking actions, such as something akin to SIOCGCONF would return
! 42: * both the index and the human name.
! 43: *
! 44: * High volume transactions (such as giving a link-level ``from'' address
! 45: * in a recvfrom or recvmsg call) may be likely only to provide the indexed
! 46: * form, (which requires fewer copy operations and less space).
! 47: *
! 48: * The form and interpretation of the link-level address is purely a matter
! 49: * of convention between the device driver and its consumers; however, it is
! 50: * expected that all drivers for an interface of a given if_type will agree.
! 51: */
! 52:
! 53: #ifndef _NET_IF_DL_H_
! 54: #define _NET_IF_DL_H_
! 55:
! 56: /*
! 57: * Structure of a Link-Level sockaddr:
! 58: */
! 59: struct sockaddr_dl {
! 60: u_char sdl_len; /* Total length of sockaddr */
! 61: u_char sdl_family; /* AF_LINK */
! 62: u_int16_t sdl_index; /* if != 0, system given index for interface */
! 63: u_char sdl_type; /* interface type */
! 64: u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
! 65: u_char sdl_alen; /* link level address length */
! 66: u_char sdl_slen; /* link layer selector length */
! 67: char sdl_data[12]; /* minimum work area, can be larger;
! 68: contains both if name and ll address */
! 69: };
! 70:
! 71: #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
! 72:
! 73: #ifndef _KERNEL
! 74:
! 75: #include <sys/cdefs.h>
! 76:
! 77: __BEGIN_DECLS
! 78: void link_addr(const char *, struct sockaddr_dl *);
! 79: char *link_ntoa(const struct sockaddr_dl *);
! 80: __END_DECLS
! 81:
! 82: #endif /* _KERNEL */
! 83: #endif /* _NET_IF_DL_H_ */
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